Add feedback link

To help improve manuals for users, we need their feedback.
This PR adds a feedback link in place of the updated date and moves
the updated date to sit with the departmental meta data as shown below:

![manual_change](https://cloud.githubusercontent.com/assets/265403/4842890/ed345dce-602a-11e4-8479-1359a39350f6.png)

The feedback link will direct the user to: https://www.gov.uk/contact/govuk to give feedback.
(when [this](https://github.com/alphagov/feedback/pull/143) gets merged that page will also show the 'a specific page' radio as selected)